Whedon described working on the first season of the Marvel series as "a quick and crazy learning experience".

"We know that coming out of the gate, people were expecting a Marvel movie every week," Tancharoen said. "That's just logistically impossible as far as us being on that scale. But I do feel like we are living up to that model a little bit."

Marvel's Agents of SHIELD airs on ABC (Tuesdays, 8/7c) in the US and on Channel 4 (Fridays, 8pm) in the UK.